The phrase "turns informer" means to become a snitch or betray someone's trust by revealing confidential information. Its antonyms (opposite words) would be "loyal friend," "confidante," or "trustworthy ally." These words suggest dependability, commitment, and a willingness to keep secrets. Other antonyms include "private," "protective," and "discreet," which indicate an inclination towards privacy and cautiousness. When we talk about someone who "turns informer," we often have negative connotations associated with the phrase. That is why antonyms like "loyal friend" and "trustworthy ally" help to frame the conversation positively and shift the focus to virtues like loyalty, trust, and dependability.